2 + 1 Highways: Overview and Future Directions

Table 2

Comparison of international 2 + 1 roadway cross sections.

Country	Median barrier	Width (m)
		Single-lane	Two-lane	Paved shoulder	Median	Total paved
Swedish MML [10]	Yes	3.75	3.25	0.50	1.75	13.00
Swedish MLV [10]	Yes	3.25	3.25	0.75	1.00	12.25
German EKL1 [14]	No	3.50	3.25–3.50	0.50–0.75	1.00	15.50
German EKL2 [14]	No	3.50	3.25–3.50	0.50–0.75	0.50	15.00
Finland [21]	Yes	3.75	3.25–3.50	0.90–1.25	1.70	14.35
Finland [21]	No	3.75	3.25–3.50	1.25	0.00	13.00
Denmark [27]	No	3.75	3.50–3.75	0.50	1.00	13.00
Norway [28]	Yes	3.50	3.25	0.75–1.50	2.50	14.75
Ireland [8]	Yes	3.50	3.50	0.50–1.00	1.00	13.00
Ireland [8]	Yes	3.25–3.50	3.50	0.50	1.00	12.25
United Kingdom [32]	No	3.50	3.50	1.00	1.00	13.50
United Kingdom [32]	No	3.50	3.50	1.00	0.75	13.00
South Korea [15]	No	3.50	3.25	1.50	1.50	14.50
South Korea [15]	No	3.50	3.25	1.50	0.50	13.50
France	Yes	3.00	3.00	1.50	1.50	13.50
France	No	3.25	3.25	0.50	1.00	12.50
Poland [22, 33]	Yes	3.50	3.50	1.00	0.50	13.00
Poland [33]	No	3.50	3.50	1.00	0.50–1.00	13.00–13.50
Spain [12]	Yes	3.50	3.20	1.00–1.50	1.60	14.00
Spain [23]	Yes	3.50	3.25–3.50	1.50	1.00	14.25
Japan [38]	Yes	3.25	3.25	1.00	1.25	13.00
Texas, US [39]	No	3.35–3.65	3.35–3.65	0.90–3.00	0.00	11.85–16.95